U.S. patent number 11,441,749 [Application Number 16/904,547] was granted by the patent office on 2022-09-13 for lighting assembly for electrically adjustable light distributions.
This patent grant is currently assigned to Fusion Optix, Inc.. The grantee listed for this patent is Fusion Optix, Inc.. Invention is credited to Michael Demas, Timothy Kelly, Lee Mantha, John Montminy, Terence Yeo.
United States Patent |
11,441,749 |
Yeo , et al. |
September 13, 2022 |
Lighting assembly for electrically adjustable light
distributions
Abstract
Disclosed is an electrically addressable lighting assembly for
providing different adjustable light distribution patterns. The
light distributions can be pre-programmed or adjusted once
installed in an environment by use of a controller or control
device. The lighting assembly comprises at least one primary
optical element such as a focusing lens or light guide, which can
be backlit and/or edgelit, and light sources arranged in two or
more independently addressed electrical channels. Each light source
channel being both physically separated and electrically adjustable
in order to control light input into the optical element and
subsequently adjust the light distribution output of the lighting
assembly, The lighting assembly can be used to provide a wide range
of symmetric and asymmetric lighting distributions for direct or
indirect lighting as well as focusing or defocusing a projected
beam in a spotlight or downlight configuration, The lighting
assembly is therefore useful in a wide range of typical indoor and
outdoor lighting applications including downlighting, spotlighting,
wall washing, cove lighting, retail lighting, warehouse lighting,
It is also possible to produce useful tunable white or color
related lighting effects wherein different color temperature
variants of white or different colors, such as red, green or blue
might have different lighting distributions.
Inventors: |
Yeo; Terence (Boston, MA),
Montminy; John (Pelham, NH), Mantha; Lee (Lawrence,
MA), Demas; Michael (Charlestown, MA), Kelly; Timothy
(Brookline, MA) |
Applicant: |
Name |
City |
State |
Country |
Type |
Fusion Optix, Inc. |
Woburn |
MA |
US |
|
|
Assignee: |
Fusion Optix, Inc. (Woburn,
WA)
|
Family
ID: |
1000006555305 |
Appl.
No.: |
16/904,547 |
Filed: |
June 17, 2020 |
Prior Publication Data
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Document
Identifier |
Publication Date |
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US 20200340637 A1 |
Oct 29, 2020 |
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Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
|
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16374848 |
Apr 4, 2019 |
|
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62862677 |
Jun 17, 2019 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F21V
5/045 (20130101); F21S 8/026 (20130101); F21S
10/00 (20130101); F21V 23/008 (20130101); F21Y
2115/10 (20160801) |
Current International
Class: |
H05B
47/00 (20200101); F21V 23/00 (20150101); F21S
8/02 (20060101); F21V 5/04 (20060101); F21S
10/00 (20060101) |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Hammond; Dedei K
Parent Case Text
RELATED APPLICATIONS
This application is a continuation in part of non-provisional U.S.
application titled "LIGHTING ASSEMBLY FOR PROVIDING LIGHT
DISTRIBUTION PATTERN, AND SYSTEM AND METHOD THEREFOR" filed Apr. 4,
2019. Furthermore, this application claims the benefit of
provisional patent applications Ser. No. 62/862,677 titled
"Lighting Assembly with Controlled Light Distribution and Improved
Appearance" filed Jun. 17, 2019.
Claims
What is claimed is:
1. A lighting assembly for providing multiple adjustable light
distribution patterns in an environment, the lighting assembly
comprising; a. two or more light source channels, each being both
spatially separated and electrically controllable; b. means for
controlling the electrical power to each light source channel; c. a
primary transmissive optical element fixedly arranged with respect
to each light source channels such that; i. input light from each
light source channel is incident upon the input face of a mutually
common region of the primary transmissive optical element but at
differing beam input angles; ii. light from each light source
channel is redirected by the mutually common region of the primary
transmissive optical element and has a unique light distribution
output upon exiting the primary transmissive optical element; iii.
the primary transmissive optical element has at least one focal
region inside the lighting assembly, wherein electrical power is
proportionally allocated among light source channels to regulate
light distribution patterns of the lighting assembly.
2. The lighting assembly of claim 1 wherein the primary
transmissive optical element further comprises at least one Fresnel
lens pattern, each Fresnel lens pattern having a focal axis.
3. The lighting assembly of claim 1 wherein the focal region is a
focal point or focal line.
4. The lighting assembly of claim 1 wherein a first light source
channel is positioned outside a focal region.
5. The lighting assembly of claim 4 wherein a first light source
channel is positioned outside a focal region and a second light
source channel is positioned in a focal region.
6. The lighting assembly of claim 1 wherein proportional allocation
of electrical power to individual light source channels is
performed by a lighting controller operatively coupled to the light
source channels configured to independently control each light
source channel and proportionally divide electrical power between
light source channels to regulate light distribution patterns.
7. The lighting assembly of claim 1 wherein proportional allocation
of electrical power to individual light source channels is achieved
within a LED board having an electrical circuit including a
component providing electrical impedance to reduce current flow
through a specific light source channel.
8. The lighting assembly of claim 7 wherein the component providing
electrical impedance is a resistor.
9. The lighting assembly of claim 1 wherein each light source
channel has an optical axis and at least one optical axis is offset
from a focal axis.
10. The lighting assembly of claim 1 further comprising an
auxiliary transmissive optical element positioned sequentially in
series before or after the primary transmissive optical
element.
11. The lighting assembly of claim 10 wherein visual brightness
uniformity is increased as compared to a configuration without the
auxiliary transmissive optical element.
12. The lighting assembly of claim 10 wherein the auxiliary
transmissive optical element comprises lenticular features oriented
substantially perpendicular to a Fresnel lens pattern in the
primary transmissive optical element.
13. The lighting assembly of claim 10 wherein the unique light
distribution of the primary transmissive optical element is
redirected in an asymmetric manner by the auxiliary transmissive
optical element.
14. The lighting assembly of claim 1 wherein the configuration of
light source channels is configured as a geometry selected from the
following group; linear array, parallel rows, rectangular grid,
circular pattern, concentric rings.
15. The lighting assembly of claim 1 wherein concentric light
source channels are used to control lighting assembly beam output
width; a center light source channel producing the narrowest beam
and an outer concentric ring producing the widest beam.
16. The lighting assembly of claim 15 wherein the primary
transmissive optical element is of circular shape with a centered
circular Fresnel lens pattern.
17. The lighting assembly of claim 1 further comprising a
reflector.
18. The lighting assembly of claim 17 wherein the reflector is of
asymmetric shape and the lighting assembly has an asymmetric light
distribution.
19. The lighting assembly of claim 1 wherein the light distribution
pattern of the lighting assembly is selected from a group including
wall washing, cove lighting, task lighting, ambient lighting and
accent lighting.
20. The lighting assembly of claim 1 wherein angular spread of the
light distribution is controlled along an axis substantially
perpendicular to one of the two or more light source channels.
21. A lighting assembly for providing multiple adjustable light
distribution patterns in an environment, the lighting assembly
comprising; a. two or more light sources, each being both spatially
separated and electrically controllable; b. means for controlling
the electrical power to each light source; c. an optical element
adjacent to and disposed between a first light source and second
light source such that; i. light from a first light source is input
into a first input face of the optical element and a second light
source is input into a second input face of the optical element;
ii. light from each light source is redirected from the optical
element out of a common output face and has a unique light
distribution; wherein electrical power is proportionally allocated
among light sources to regulate light distribution patterns emitted
from the optical element to produce a light distribution pattern
which is directional and non-lambertian.
22. The lighting assembly of claim 21 wherein the optical element
is a light guide.
23. The lighting assembly of claim 21 wherein one or more of the
light sources is an LED or linear array of LEDs.
24. The lighting assembly of claim 21 wherein the light
distribution pattern of the lighting assembly is selected from a
group including wall washing, cove lighting, task lighting, ambient
lighting and accent lighting.
25. The lighting assembly of claim 21 wherein angular spread of the
light distribution is controlled along an axis substantially
perpendicular to one of the two or more light sources.
26. A lighting assembly for providing multiple adjustable light
distribution patterns in an environment, the lighting assembly
comprising; a. two or more light source channels, each being both
spatially separated and electrically controllable; b. means for
controlling the electrical power to each light source channel; c. a
primary transmissive optical element fixedly arranged with respect
to a first light source channel and second light source channel
such that; i. light from a first light source channel is input into
a first input face and light input from a second light source is
input into a second input face; ii. light from each light source
channel is redirected by the primary light transmissive optical
element and has a unique light distribution output upon exiting the
transmissive optical element; iii. with respect to the first light
source channel the primary transmissive optical element is a light
guide but with respect to the second light source channel the
primary transmissive light source channel is not a light guide but
rather a lens; wherein electrical power is proportionally allocated
among light source channels to regulate light distribution patterns
of the lighting assembly.
27. The lighting assembly of claim 26 wherein each light source
channel is comprised of a different color light source.
28. The lighting assembly of claim 26 wherein the configuration of
light source channels is configured as a geometry selected from the
following group; linear array, parallel rows, rectangular grid,
circular pattern, concentric rings.
29. The lighting assembly of claim 26 wherein the light
distribution pattern of the lighting assembly is selected from a
group including wall washing, cove lighting, task lighting, ambient
lighting and accent lighting.
30. The lighting assembly of claim 26 wherein angular spread of the
light distribution is controlled along an axis substantially
perpendicular to one of the two or more light source channels.
Description
BACKGROUND
The present disclosure relates generally to lighting systems; and
more specifically, to a lighting assembly for providing different
light distribution patterns in an environment. Furthermore, the
present disclosure relates to a system for providing different
light distribution patterns in an environment. Moreover, the
present disclosure relates to a method for providing different
light distribution patterns in an environment.
Generally, lighting devices are utilized in a wide area of
applications, such as office workspaces, warehouses, educational
institutions, research laboratories, indoor and outdoor living
spaces, industrial areas, vehicles and so forth for performing
visual tasks. Additionally, lighting devices are also employed for
aesthetic purposes in order to provide a visually comforting
environment to an individual. Conventionally, lighting systems are
affixed in the ceilings, walls and other geometric installations to
illuminate an area associated therewith.
However, there are several problems associated with the
conventional lighting devices. One of the major problems is that
such lighting systems generally use light sources for illumination
which are often fixed at a position within or in vicinity of the
regions that require lighting thereby. Such lighting systems
provide a fixed lighting direction. Further, these lighting systems
render a non-uniform distribution of light in the associated region
which may lead to visual discomfort. For example, such lighting
sources, sometimes, create glare after striking on other
surfaces.
To overcome this problem, generally, an environment or workspace is
provided with multiple small lighting devices leading to an
increase installation and maintenance costs, energy usage, wastage
of resources and environmental pollution. Even such conventional
lighting systems do not provide much customization options related
to possible patterns from the lighting devices catering to the
explicit needs of an individual. For example, the conventional
lighting devices are not versatile enough to easily adapt according
to the tasks being performed by an individual in real-time, the
emotional status of an individual and so forth.
Few solutions known in the art require physical movement of the
lighting devices in order to change a lighting direction and
lighting area associated therewith to adapt to the environment.
However, such frequent movement of the existing lighting devices
may cause damage such as wear and tear of the existing lighting
devices, thereby leading to a decrease in efficiency and life of
the lighting device. Furthermore, requirement of frequent movement
of the existing lighting devices causes waste of time, discomfort
and require extra effort on part of the user thereof.
Therefore, in light of the foregoing discussion, there exists a
need to overcome the aforementioned drawbacks associated with the
existing lighting devices.
SUMMARY
Disclosed is an optical assembly for providing different adjustable
light distribution patterns in an environment. The lighting
assembly comprises at least one optical element and two or more
light source channels each comprising one or more light sources,
each light source channel being both physically separated and
electrically adjustable in order to control light input into the
optical element and subsequently adjust the light distribution
output of the optical assembly.
The present disclosure provides a lighting assembly for providing
different light distribution patterns in an environment. The
present disclosure also provides a system for providing different
light distribution patterns in an environment. Furthermore, the
present disclosure further provides a method for providing
different light distribution patterns in an environment. The
present disclosure seeks to provide a solution to the existing
problem of non-uniform distribution of light leading to visual
discomfort, non-availability of environment oriented, adaptable
lighting systems. Furthermore, the present disclosure seeks to
provide a solution to the existing problem wastage of electrical
energy due to improper lighting in an environment. An aim of the
present disclosure is to provide a solution that overcomes at least
partially the problems encountered in prior art, and provides a
compact, durable, robust, and interactive lighting assembly for
providing different light distribution patterns, a system for
providing different light distribution patterns and a method for
providing different light distribution patterns.
Embodiments of the present disclosure substantially eliminate or at
least partially address the aforementioned problems in the prior
art, and provides an improved lighting assembly to provide
different light distribution patterns responsive to the surrounding
environment. The present disclosure eliminates wastage of light
energy and improves energy efficiency. Furthermore, the lighting
assembly disclosed is controllable to customize the lighting in and
around the environment.
Additional aspects, advantages, features and objects of the present
disclosure would be made apparent from the drawings and the
detailed description of the illustrative embodiments construed in
conjunction with the appended claims that follow.
It will be appreciated that features of the present disclosure are
suitable to being combined in various combinations without
departing from the scope of the present disclosure as defined by
the appended claims.
BRIEF DESCRIPTION OF FIGURES
The summary above, as well as the following detailed description of
illustrative embodiments, is better understood when read in
conjunction with the appended drawings. For the purpose of
illustrating the present disclosure, exemplary constructions of the
disclosure are shown in the drawings. However, the present
disclosure is not limited to specific methods and instrumentalities
disclosed herein. Moreover, those in the art will understand that
the drawings are not to scale. Wherever possible, like elements
have been indicated by identical numbers.
Embodiments of the present disclosure will now be described, by way
of example only, with reference to the following diagrams
wherein:
The summary above, as well as the following detailed description of
illustrative embodiments, is better understood when read in
conjunction with the appended drawings. For the purpose of
illustrating the present disclosure, exemplary constructions of the
disclosure are shown in the drawings. However, the present
disclosure is not limited to specific methods and instrumentalities
disclosed herein. Moreover, those in the art will understand that
the drawings are not to scale. Wherever possible, like elements
have been indicated by identical numbers.
Embodiments of the present disclosure will now be described, by way
of example only, with reference to the following diagrams
wherein:
FIG. 1 is a block diagram of a lighting assembly for providing
different light distribution patterns, in accordance with an
embodiment of the present disclosure;
FIG. 2 is a schematic illustration of an exemplary arrangement of a
lighting assembly, in accordance with an embodiment of the present
disclosure;
FIGS. 3A-3F are schematic illustrations of different light
distribution patterns provided by the lighting assembly of FIG. 2,
in accordance with various embodiments of the present
disclosure;
FIG. 4 is a schematic illustration of an exemplary arrangement of a
lighting assembly, in accordance with another embodiment of the
present disclosure;
FIGS. 5A-5F are schematic illustrations of different light
distribution patterns provided by the lighting assembly of FIG. 4,
in accordance with various embodiments of the present
disclosure;
FIG. 6 is a schematic illustration of an exemplary arrangement of a
lighting assembly, in accordance with yet another embodiment of the
present disclosure;
FIGS. 7A-7D are schematic illustrations of different light
distribution patterns provided by the lighting assembly of FIG. 6,
in accordance with various embodiments of the present
disclosure;
FIG. 8 is a schematic illustration of an exemplary arrangement of a
lighting assembly, in accordance with still another embodiment of
the present disclosure;
FIGS. 9A-9E are schematic illustrations of different light
distribution patterns provided by the lighting assembly of FIG. 8,
in accordance with various embodiments of the present
disclosure;
FIG. 10 is a schematic illustration of an exemplary arrangement of
a lighting assembly, in accordance with still another embodiment of
the present disclosure;
FIGS. 11A-11D are schematic illustrations of different light
distribution patterns provided by the lighting assembly of FIG. 10,
in accordance with various embodiments of the present
disclosure;
FIGS. 12A-12E are schematic representations of arrangements of
lighting assemblies, in accordance with various exemplary
embodiments of the present disclosure;
FIG. 13 is a schematic illustration of a lighting assembly arranged
in a suspended ceiling, in accordance with an exemplary embodiment
of the present disclosure;
FIG. 14 is a schematic illustration of a system for providing
different light distribution patterns, in accordance with an
embodiment of the present disclosure;
FIG. 15 is a schematic illustration of an exemplary implementation
of the system of FIG. 14, in accordance with an embodiment of the
present disclosure; and
FIG. 16 is a flowchart of a method for providing different light
distribution patterns in an environment by implementing a lighting
assembly, in accordance with an embodiment of the present
disclosure.
FIG. 17 is a perspective view of a lighting assembly with single
light source channel.
FIG. 18 is a cross-section view of a lighting assembly with a
single light source channel and an optical element comprising a
Fresnel lens.
FIG. 19A and FIG. 19B are polar plots from the lighting assembly
embodiment of FIG. 18.
FIG. 20 is a cross-section view of an embodiment lighting assembly
having an optical element with two linear Fresnel lenses.
FIG. 21 is a polar plot of the light distribution of the lighting
assembly of FIG. 20.
FIG. 22 is a cross-section view of a lighting assembly embodiment
having a Fresnel lens and additional diffuser component.
FIG. 23A and FIG. 23B are polar plots of the light distribution of
the lighting assembly of FIG. 22 without and with the additional
diffuser.
FIG. 24A is cross-section view of a lighting assembly having a
Fresnel lens and an additional longitudinal beam spread lens.
FIG. 24B is a polar plot of light distribution from the lighting
assembly embodiment of FIG. 24A showing both transverse and
longitudinal axes.
FIG. 24C is a photograph showing the improved uniformity appearance
of the lighting assembly embodiment of FIG. 24A.
FIG. 25 is a cross-section view of a lighting assembly embodiment
with three light source channels and a Fresnel lens.
FIG. 26A is a perspective of a round downlight suitable for
mounting into a ceiling.
FIG. 26B is an exploded view of the round downlight embodiment of
FIG. 26A.
FIG. 27A is an exploded view of a round downlight embodiment. The
same lighting assembly embodiment is shown in FIG. 27B, FIG. 27C,
and FIG. 27D in perspective views of select internal
components.
In the accompanying drawings, an underlined number is employed to
represent an item over which the underlined number is positioned or
an item to which the underlined number is adjacent. A
non-underlined number relates to an item identified by a line
linking the non-underlined number to the item. When a number is
non-underlined and accompanied by an associated arrow, the
non-underlined number is used to identify a general item at which
the arrow is pointing.
DETAILED DESCRIPTION
The following detailed description illustrates embodiments of the
present disclosure and ways in which they can be implemented.
Although some modes of carrying out the present disclosure have
been disclosed, those skilled in the art would recognize that other
embodiments for carrying out or practicing the present disclosure
are also possible.
In overview, embodiments of the present disclosure are concerned
with a lighting assembly for providing different light distribution
patterns in an environment. Furthermore, embodiments of the present
disclosure also provide a system for providing different light
distribution patterns in an environment. Additionally, embodiments
of the present disclosure provide a computer implemented method for
providing different light distribution patterns in an environment
by implementing a lighting assembly.
Referring to FIG. 1, illustrated is a schematic representation of a
lighting assembly 100 for providing different light distribution
patterns in an environment, in accordance with an embodiment of the
present disclosure. As shown, the lighting assembly 100 comprises
two or more light sources 102, at least one optical element 104 and
a controller 106. Each of the two or more light sources 102 is
configured to emit a light beam. Each of the two or more light
sources 102 is arranged in a manner so as to emit the respective
light beams along channels (shown in FIG. 3) different from each
other. Notably, the different light sources 102 emit different
light beams along different channels. The term "channel" as used
herein refers to a path or a pattern followed by the light beam
emitted from the light source 102. It will be appreciated that a
light beam emitted from one or more light source 102 (such as a
multitude of Light Emitting Diodes LEDs) in a definite path or a
pattern will also be referred to as a channel. In an example, the
light beam of a definite beam spread and a definite beam angle will
be referred to as a channel of the light source 102. Optionally,
the lighting assembly 100 comprises two or more directional light
sources that are aimed at different angles to illuminate different
target areas in an environment. Throughout the present disclosure
the term "target area" as used herein refers to a portion or area
of the surface intended to be illuminated by two or more light
sources 102. Optionally, the lighting assembly 100 may be provided
with an outer housing or covering to protect its various elements
enclosed therein. Alternatively, the two or more light sources 102,
the at least one optical element 104 and the controller 106 may be
arranged as independent elements in the ceiling, walls or other
surfaces where the lighting assembly 100 is installed.
The term "lighting assembly" 100 as used herein may generally
relate to any lighting assembly 100 for use both in general and
specialty lighting. The term general lighting includes use in
living spaces such as lighting in industrial, commercial,
residential and transportation vehicle applications. The term
specialty lighting includes emergency lighting activated during
power failures, fires or smoke accumulations in buildings,
microscope, stage illuminators, and billboard front-lighting,
hazardous and difficult access location lighting, backlighting for
signs, agricultural lighting and so forth.
Throughout the present disclosure, the term "light sources" 102 is
used to refer to any electrical device capable of receiving an
electrical signal and producing electromagnetic radiation or light
in response to the signal. The light sources 102 may be configured
to generate electromagnetic radiation within the visible spectrum,
outside the visible spectrum, or a combination of both. The term
"light" is used when the electromagnetic radiation is within the
visible ranges of frequency and the term "radiation" is used when
the electromagnetic radiation is outside the visible ranges of
frequency. Notably, the light sources may be configured for a
variety of applications, including, but not limited to, indication,
display, and/or illumination. Generally, the light sources 102 are
particularly configured to generate radiation or light having a
sufficient intensity to effectively illuminate an interior or
exterior environment or targeted area. In this context, "sufficient
intensity" refers to sufficient radiant power in the visible
spectrum generated in the space or environment. The unit "lumens"
is often employed to represent the total light output from the
light source 102 in all directions, in terms of radiant power or
luminous flux. The light sources may use lights of any one or more
of a variety of radiating sources, including, but not limited to,
Light Emitting Diode LED-based sources (including one or more
LEDs), electroluminescent strips, incandescent sources (e.g.,
filament lamps, halogen lamps), fluorescent sources, phosphorescent
sources, high-intensity discharge sources (e.g., sodium vapor,
mercury vapor, and metal halide lamps), lasers, other types of
electroluminescent sources such as, photo-luminescent sources
(e.g., gaseous discharge sources), cathode luminescent sources
using electronic satiation, galvano-luminescent sources,
crystallo-luminescent sources, kine-luminescent sources,
thermo-luminescent sources, triboluminescent sources,
sonoluminescent sources, radioluminescent sources, and luminescent
polymers. It will be appreciated that the two or more light sources
102 are employed for providing different light distribution
patterns as one light source 102 may not always have the
flexibility to provide the correct distribution pattern, such as
maintaining correct intensity and color temperature for the
lighting over the changing environmental conditions. Notably, two
or more differentiated light sources 102 will have an increased
operating range, thereby having better possibility of providing the
desired light distribution pattern. Optionally, the light sources
102 at a particular aiming may all be one color, say white or may
be of different colors which when combined together yield a
different colored light distribution pattern. Altering the radiated
power of two or more light sources 102 leads to formation of
different light distribution patterns in a variety of colors.
Optionally, the lighting assembly 100 comprises a power source for
providing electrical power to the two or more lighting sources
102.
According to an embodiment, the lighting assembly 100 further
comprises at least one driver (not shown) associated with each of
the two or more light sources 102, wherein the at least one driver
is adapted to be regulated based on the defined light distribution
pattern to, thereby, control the electrical potential supplied to
the associated light source 102. The term "driver" as used herein
refers to any discrete circuitry such as passive or active analog
components including resistors, capacitors, inductors, transistors,
operational amplifiers, and so forth, as well as discrete digital
components such as logic components, shift registers, latches, or
any other separately packaged chip or other component for realizing
a digital signal. The driver is regulated to control an electrical
supply to each of the light sources 102, in order to regulate the
intensity and/or color of the light beam associated with one or
more of the light sources 102. In an example, the driver associated
with each of the light sources 102 is a manual switch. The switch
may be operated by the user to achieve a desired light distribution
pattern.
According to an embodiment, the at least one optical element 104 is
fixedly arranged with respect to the two or more light sources 102
to be disposed along the channels of the emitted light beams
therefrom. The at least one optical element 104 is configured to
guide the emitted light beams towards two or more distinct optical
paths to illuminate different targeted surfaces in the environment.
Notably, the light beams emitted from the light sources 102 are
incident on the optical element and are further guided by any of
the known optical phenomenon such as refraction, reflection, and/or
diffraction. Therefore, the light beams when passed through the
optical element 104 are guided towards distinct optical paths. It
will be appreciated that the direction in which the optical path is
directed is based on the characteristic property of the optical
element 104 and the directionality of the light sources 102. In an
example, a beam angle and a beam spread of the optical path will
depend on the characteristic property of the optical element 104.
The optical elements 104 include, but are not limited to a
collimating lens, a refractive lens, a light guide, a diffuser and
a reflector. It will be appreciated that the characteristics of the
optical path followed by the light beam depends on one or more of
the types of the optical element 104 employed, distance of the
optical element 104 from the light sources 102, the inherent
properties of the optical element 104 such as the refractive index
and so forth. The design and type of optical element 104 employed
for a particular lighting assembly ensures generation of
concentrated light beams leading to effective utilization. In other
words, the optical elements 104 ensure that most of the light
energy generated by the light sources 102 is effectively used to
generate the light distribution pattern as desired. In an example,
the optical element 104 is a collimating lens that is configured to
generate a light beam of most of light flux that is incident on one
face of the collimating lens into a parallel beam with a minimum
spill outside the beam. In another example, the optical element 104
is a light guide. The light guide provides a larger surface for
emitted light, i.e. increasing the beam width of the emitted light
which reduces the glare while maintaining directionality.
Optionally, the optical elements 104 also define the shape of the
output beam of the light sources. In an example, the optical
element 104 may produce light of varied patterns, such as round,
rectangular, batwing, oval and the like.
Throughout the present disclosure, the term "light distribution
pattern" refers to the visual patterns of light from a light source
102 distributed over a spatial area. The light distribution pattern
is the visual characteristic property of the light beam emitted
from the two or more light sources 102. The properties that define
the representation of a light may include intensity, spectral
distribution, spatial distribution, chromaticity, color temperature
and the like. The light distribution pattern may be distributed
over a range of angles. It will be appreciated that the light
distribution pattern of a particular light source 102 is based on
one or more properties of the light source 102, optical element
104, the distance between the light source 102 and the optical
element 104, the electrical potential supplied and so forth. The
different light distribution patterns may generally include wall
washing, cove lighting, task lighting, ambient lighting and accent
lighting. It will be appreciated that a property of any of the
light distribution pattern may be altered to produce a different
light distribution pattern.
The term "spectrum" or "color" as used herein refers to one or more
frequencies (or wavelengths) of radiation produced by the two or
more light sources 102. Accordingly, the term "spectrum" refers to
frequencies (or wavelengths) not only in the visible range, but
also frequencies (or wavelengths) in the infrared, ultraviolet, and
other areas of the overall electromagnetic spectrum. Also, a given
spectrum may have a relatively narrow bandwidth (e.g., a FWHM
having essentially few frequency or wavelength components) or a
relatively wide bandwidth (several frequency or wavelength
components having various relative strengths). It will be
appreciated that a given spectrum may be the result of a mixing of
two or more other spectra (e.g., mixing radiation respectively
emitted from multiple light sources). Additionally, the term
"colors" implicitly refers to multiple spectra having different
wavelength components and/or bandwidths. It also should be
appreciated that the term color may be used in connection with both
white and non-white light.
The term "color temperature" as used herein generally refers to a
particular color content or shade (e.g., reddish, bluish) of white
light. The color temperature of a given radiation sample
conventionally is characterized according to the temperature in
degrees Kelvin (K) of a black body radiator that radiates
essentially the same spectrum as the radiation sample under
analysis. The black body radiator color temperatures generally fall
within a range of from approximately 700 degrees K (typically
considered the first visible to the human eye) to over 10,000
degrees K; white light generally is perceived at color temperatures
above 1500-2000 degrees K. Furthermore, lower color temperatures
generally indicate white light having a more significant red
component or a warmer feel, while higher color temperatures
generally indicate white light having a more significant blue
component or a cooler feel. In an example, fire has a color
temperature of approximately 1,800 degrees K, a conventional
incandescent bulb has a color temperature of approximately 2848
degrees K, early morning daylight has a color temperature of
approximately 3,000 degrees K, and overcast midday skies have a
color temperature of approximately 10,000 degrees K.
According to an embodiment, the controller 106 operatively coupled
to the two or more light sources 102. The controller 104 is
configured to independently control electrical potential supplied
to the two or more light sources 102 to regulate an intensity of
the light beams emitted therefrom based on a defined light
distribution pattern. Notably, the controller 106 can be
implemented within the housing of the lighting assembly 100, or
outside the housing of the lighting assembly 100. The controller
106 is configured to independently control a light source 102 or a
group of light sources 102 depending upon the area of application
and desired light distribution pattern. Throughout the present
disclosure, the term "controller" 106 as used herein generally
describes various apparatus or devices for processing the
electrical signals and thereby controlling the operation of each of
the two or more light sources 102 based on the electrical signals.
Notably, the controller 106 is configured to regulate the magnitude
of the electrical potential supplied to each of the two or more
light sources 102. Furthermore, the change in the magnitude of the
electrical potential leads to a change in intensity and/or spectrum
of the light beams emitted from the light sources 102. The
controller 106 is operated in a manner so as to regulate the light
beams emitted from the light sources 102 to obtain a particular
light distribution pattern. It will be appreciated that the
controller 106 can be implemented in numerous ways. In an example,
the controller 106 is a dedicated hardware to perform the functions
discussed herein. In another example, the controller 106 can be one
or more microprocessors that may be programmed using software
(e.g., microcode) to perform various functions discussed herein. In
another example, the controller 106 may be a pulse width modulator,
pulse amplitude modulator, pulse displacement modulator, resistor
ladder, current source, voltage source, voltage ladder, switch,
transistor, voltage controller, or other controller. The controller
106 generally regulates the current, voltage and/or power through
the light source 102, in response to signals received. In an
example, several light sources 102 emitting different colors may be
used. Each of these light sources 102 emitting different colors may
be driven through separate controllers 106. Furthermore, the
controller 106 may be implemented with or without employing a
processor, and also may be implemented as a combination of
dedicated hardware to perform some functions and one or more
programmed microprocessors along with an associated circuitry to
perform other functions. Examples of controller 106 that may be
employed in various embodiments of the present disclosure include,
but are not limited to, conventional microprocessors, application
specific integrated circuits (ASICs), and field-programmable gate
arrays (FPGAs). For LED light source circuits, current limiting
drivers are commonly used to.
According to an embodiment, the controller 106 comprises a memory
(not shown) having pre-configured light distribution patterns
stored therein, and wherein the controller 106 provides a user
interface to allow a user to select one of the pre-configured light
distribution patterns to provide the defined light distribution
pattern. The memory is configured to store several different light
distribution patterns based on one or more of intensity values of
each of the light sources 102, color values of each of the light
sources 102 and color temperature of each of the light sources 102.
The different light distribution patterns thus obtained are stored
in the memory for later retrieval. The term "memory" as used herein
refers any physical device or hardware component capable of storing
information temporarily and/or permanently. The different types of
memory include but do not limit to, read-only memory, programmable
read-only memory, electronically erasable programmable read-only
memory, random access memory, dynamic random access memory, double
data rate random access memory, Rambus direct random access memory,
flash memory, or any other volatile or non-volatile memory for
storing program instructions, program data, and program output for
providing different light distribution patterns. Notably, the
controller 106 and the memory can be implemented as different
hardware components or may be implemented as a single hardware
component within the lighting assembly 100.
According to an embodiment, the controller 106 provides a user
interface allowing the user to select a particular pre-configured
light distribution pattern from the memory. Furthermore, once a
light distribution pattern is selected, the user interface also
allows the user to modify the parameters of the selected light
distribution pattern. Optionally, the user interface may constitute
a button, a dial, a slider and the like for selecting a
pre-configured light distribution pattern. In an example, the user
interface comprises a two-button interface, wherein a first button
is operable to select a particular light distribution pattern, and
a second button is operable to control a particular parameter (such
as intensity, color, spectrum and the like) associated with the
selected light distribution pattern. For example, in this
particular configuration, the second button may be held in a closed
position with a parameter changing incrementally until the button
is released, or the parameter may be changed each time the button
is held and released. In another example, the interface may include
a button and an adjustable input such as a slider. The button may
be operable to control transitions from one light distribution
pattern to other. The adjustable input may be operable to control
the adjustment of a parameter value within a particular light
distribution pattern. The adjustable input may be, for example, a
dial, a slider, a knob, or any other device whose physical position
may be converted to a parameter value for use by the controller
106. In another example, the interface may include two adjustable
inputs. A first adjustable input may be operable to select a
pre-configured light distribution pattern from the memory, and a
second adjustable input may be operable to control a parameter
within the light distribution pattern. In another example, a single
dial may be used to cycle through all modes and parameters in a
continuous fashion. It will be appreciated that other controls are
possible, including keypads, touch pads, sliders, switches, dials,
linear switches, rotary switches, variable switches, thumb wheels,
dual inline package switches, or other input devices suitable to be
operated by a user. It will be appreciated that the controller 106
may be configured to control a plurality of lighting assemblies
arranged in an environment to control the overall lighting
distribution of the environment.
Referring from FIG. 2 to FIG. 11D, illustrated are schematic
representations of various exemplary arrangements of the lighting
assembly 200, 400, 600, 800, 1000 and the respective light
distribution pattern of each of the lighting assemblies, in
accordance with various embodiments of the present disclosure. It
will be appreciated that the embodiments as discussed herein are
merely some of the several possible arrangements of the lighting
assembly and should not unduly limit the scope of the claims
herein.
Referring to FIG. 2, illustrated is a schematic representation of
arrangement of elements of a lighting assembly 200 (such as the
lighting assembly of FIG. 1), in accordance with an embodiment of
the present disclosure. As shown, the lighting assembly 200
comprises two or more light sources 202, 204 and 206 (such as the
light sources of FIG. 1) that are arranged in a linear manner at a
fixed elevation. Further, the lighting assembly 200 comprises at
least one optical element 208 (such as the optical element of FIG.
1) arranged below the two or more light sources 202, 204 and 206.
Optionally, the optical element 208 may be arranged above the light
sources 202, 204 and 206. It will be appreciated that the
arrangement of the optical element 208 will depend on the direction
of light emitted from the light sources 202, 204, and 206.
Optionally, the light sources 202, 204 and 206 may be arranged in a
circular manner and the optical source may be disposed above or
below the light sources 202, 204 and 206. Further, the lighting
assembly 200 comprises a controller 210.
In the illustrated embodiment, as shown, the lighting assembly 200
comprises three light sources 202, 204 and 206, the optical element
208 and the controller 210. The light sources 202, 204, and 206 are
arranged in a linear manner at a fixed elevation with respect to
the optical element 208. In an example, the light sources 202, 204
and 206 are arranged at a height of 20mm with respect to the
optical element 208. Furthermore, the optical element 208 is
arranged on an axis perpendicular to the plane of the light source
204. The optical element 208 is arranged in a manner such that a
corresponding light beam that is emitted from each of the light
sources 202, 204 and 206 along channels 212A, 214A and 214A,
respectively is received at the optical element 208. Further, each
of the light beams emitted along the channels 212A, 214A and 216A
from the light sources 202, 204 and 206 respectively, are guided by
the optical element 208 to respective distinct optical paths 212B,
214B and 216B to illuminate different targeted surfaces in the
environment. Notably, the light source 202 is aimed at a specific
angle to illuminate a specific targeted surface, the light source
204 is aimed at another specific angle to illuminate another
specific targeted surface and the light source 206 is aimed at yet
another specific angle to illuminate yet another specific targeted
surface. When in operation, the light sources 202, 204 and 206 are
independently controlled via the controller 210 to obtain different
light distribution patterns. Notably, the light sources can be of
same color or different, say color LED packages.
Referring to FIGS. 3A-3F, illustrated are schematic illustrations
of different light distribution patterns provided by operating one
or more of the light sources 202, 204 and 206 of FIG. 2, in
accordance with various embodiments of the present disclosure.
Notably, FIGS. 3A to 3F are described in conjunction with elements
from FIG. 2. As illustrated in FIG. 3A, a first light distribution
pattern 300A (such as a task lighting pattern) is generated at a
specific angle to illuminate a targeted surface associated
therewith. Herein, the first light distribution pattern 300A
comprises a light beam 302A emitted from the light source 202 to
illuminate a targeted surface. In an example, the first light
distribution pattern 302A is generated at an angle of 30 degrees
measured in an anti-clockwise sense with respect to an axis 304A
perpendicular to an axis of linear arrangement of the light sources
202, 204 and 206. Notably, the first light distribution pattern
300A is generated by setting the magnitude of electrical potential
of light source 204, and light source 206 to 0 Volts and the
magnitude of electrical potential of light source 202 to specified
maximum value, say 10 Volts, thereby generating the first light
distribution pattern 300A comprising the light beam 302A. It will
be appreciated that the intensity value and/or the color value of
the first light distribution pattern 300A can be altered by
employing aforementioned user interface provided by the controller
210.
As illustrated in FIG. 3B, a second light distribution pattern 300B
(such as a task lighting pattern) is generated at a specific angle
to illuminate a targeted surface associated therewith. Herein, the
second light distribution pattern 300B comprises a light beam 302B
emitted from the light source 204 to illuminate a targeted surface.
In an example, the second light distribution pattern 300B is
generated at an angle of 0 degrees with respect to an axis 304B
perpendicular to the axis of linear arrangement of the light
sources 202, 204 and 206. Notably, the second light distribution
pattern 300B is generated by setting the magnitude of electrical
potential of light source 202, and light source 206 to 0 Volts and
the magnitude of electrical potential of light source 204 to a
specified maximum value, say 10 Volts, thereby generating the
second light distribution pattern 300B comprising the light beam
302B. It will be appreciated that the intensity value and/or the
color value of the second light distribution pattern 300B can be
altered by employing aforementioned user interface provided by the
controller 210.
As illustrated in FIG. 3C, a third light distribution pattern 300C
(such as a task lighting pattern) is generated at a specific angle
to illuminate a targeted surface associated therewith. Herein, the
third light distribution pattern 300C, comprises a light beam 302C
emitted from the light source 206 to illuminate the targeted
surface. In an example, the third light distribution pattern 300C
is generated at an angle of 30 degrees in a clockwise sense with
respect to an axis 304C perpendicular to the axis of linear
arrangement of the light sources 202, 204 and 206. Notably, the
third light distribution pattern 300C is generated by setting the
magnitude of electrical potential of light source 202, and the
light source 204 to 0 Volts and the magnitude of electrical
potential of the light source 206 to a specified maximum value, say
10 Volts, thereby generating the third light distribution pattern
300C comprising the light beam 302C. It will be appreciated that
the intensity value and/or the color value of the third light
distribution pattern 300C can be altered by employing
aforementioned user interface provided by the controller 210.
As illustrated in FIG. 3D, a fourth light distribution 300D pattern
is generated to dominantly illuminate the target surface associated
with the light source 202. Herein, the fourth light distribution
pattern 300D, comprises a light beam 302D emitted from the light
source 202, a light beam 304D emitted from the light source 204 and
a light beam 306D emitted from the light source 206 to illuminate
the targeted surface. In an example, the fourth light distribution
pattern 300D is generated by setting the magnitude of electrical
potential of the light source 202 to a specified maximum value, say
10 Volts to generate the light beam 302D, and the magnitude of
electrical potential of each of the light source 204 and the light
source 206 to a specified intermediate value, say 2 Volts, to
generate the light beams 304D and 306D respectively, thereby
generating the fourth light distribution pattern 300D. The fourth
light distribution pattern 300D is dominantly generated at an angle
of 30 degrees in an anti-clockwise sense with respect to an axis
308D perpendicular to the axis of arrangement of the light sources
202, 204 and 206. It will be appreciated that the intensity value
and/or the color value of the fourth light distribution pattern
300D can be altered by employing aforementioned user interface
provided by the controller 210.
As illustrated in FIG. 3E, a fifth light distribution pattern 300E
is generated to dominantly illuminate the target surface associated
with the light source 204. Herein, the fifth light distribution
pattern 300E, comprises a light beam 302E emitted from the light
source 202, a light beam 304E emitted from the light source 204 and
a light beam 306E emitted from the light source 206 to illuminate
the targeted surface. In an example, the fifth light distribution
pattern 300E is generated by setting the magnitude of electrical
potential of the light source 204 to a specified maximum value, say
10 Volts to generate the light beam 304E, and the magnitude of
electrical potential of each of the light source 202 and the light
source 206 to a specified intermediate value, say 2 Volts, to
generate the light beam 302E and the light beam 306E respectively,
thereby generating the fifth distribution pattern 300E. The fifth
light distribution pattern 300E is generated dominantly at an angle
of 0 degrees with respect to an axis 308E perpendicular to the axis
of linear arrangement of the light sources 202, 204 and 206. It
will be appreciated that the intensity value and/or the color value
of the fifth light distribution pattern 300E can be altered by
employing aforementioned user interface provided by the controller
210.
As illustrated in FIG. 3F, a sixth light distribution pattern 300F
is generated to dominantly illuminate the target surface associated
with the light source 206. Herein, the sixth light distribution
pattern 300F, comprises a light beam 302F emitted from the light
source 202, a light beam 304F emitted from the light source 204 and
a light beam 306F emitted from the light source 206 to illuminate
the targeted surface. In an example, the sixth light distribution
pattern 300F is generated by setting the magnitude of electrical
potential of the light source 206 to a specified maximum value, say
10 Volts, to generate the light beam 306F and the magnitude of
electrical potential of each of the light source 202 and the light
source 204 to a specified intermediate value, say 2 Volts, to
generate the light beam 302F and 304F respectively, thereby
generating the sixth distribution pattern 300F. The sixth light
distribution pattern 300F is generated dominantly at an angle of 30
degrees in a clockwise sense with respect to an axis 308F
perpendicular to the axis of arrangement of light sources 202, 204
and 206. It will be appreciated that the intensity value and/or the
color value of the sixth light distribution 300F pattern can be
altered by employing aforementioned user interface provided by the
controller 210.
Referring to FIG. 4, illustrated is a schematic representation of
arrangement of elements of a lighting assembly 400 (such as the
lighting assembly of FIG. 1), in accordance with an embodiment of
the present disclosure. As shown, the lighting assembly 400
comprises two or more light sources 402, 404 and 406 (such as the
light sources of FIG. 1) that are arranged in a linear manner at a
fixed elevation. Further, the lighting assembly 400 comprises at
least one optical element 408 (such as the optical element of FIG.
1) arranged below the two or more light sources 202, 204 and 206.
Optionally, the optical element 408 may be arranged above the light
sources 402, 404 and 406. Further, the lighting assembly 400
comprises a controller 410. The light sources 402, 40 and 406 are
arranged in a linear manner at a fixed elevation with respect to
the optical element 408. In an example, the light sources 402, 404
and 406 are arranged at a height of, say, 20 mm with respect to the
optical element 408. Furthermore, the optical element 408 is
arranged on an axis perpendicular to the plane of light source 402.
The optical element 408 is arranged in a manner such that the light
beam is emitted from the light source 402 along the channel 412A,
from the light source 402 along the channel 414A, and from the
light source 406 along the channel 416A. Further, the light beams
emitted along the channels 412A, 414A and 416A from the light
sources 402, 404 and 406 respectively, are guided by the optical
element 408 to respective distinct optical paths 412B, 414B and
416B to illuminate different targeted surfaces in the environment.
Notably, the light source 402 is aimed at a specific angle to
illuminate a specific targeted surface, the light source 404 is
aimed at another specific angle to illuminate another specific
targeted surface and the light source 406 is aimed at another
specific angle to illuminate another specific targeted surface.
When in operation, the light sources 402, 404 and 406 are
independently controlled via the controller 410 to obtain different
light distribution patterns. Notably, the light sources can be of
same color or different, say color LED packages.
Referring to FIGS. 5A-5F, illustrated are schematic illustrations
of different light distribution patterns provided by operating one
or more of the light sources 402, 404 and 406 of FIG. 4, in
accordance with various embodiments of the present disclosure.
Notably, FIGS. 5A to 5F are described in conjunction with elements
from FIG. 4. As illustrated in FIG. 5A, a first light distribution
pattern 500A (such as perimeter lighting pattern) is generated at a
specific angle to illuminate a targeted surface associated
therewith. Herein, the first light distribution pattern 500A
comprises a light beam 502A emitted from the light source 402 to
illuminate the targeted surface. In an example, the first light
distribution pattern 500A is generated at an angle of 15 degrees
measured in an anti-clockwise sense with respect to an axis 504A
perpendicular to an axis of linear arrangement of the light sources
402, 404 and 406. Notably, the first light distribution pattern
500A is generated by setting the magnitude of electrical potential
of light source 404, and the light source 406 to 0 Volts and the
magnitude of electrical potential of light source 402 to specified
maximum value, say 10 Volts, thereby generating the first light
distribution pattern 500A comprising the light beam 502A. As shown,
the first light distribution pattern 500A illuminates a surface at
a specified distance from the wall, say 2 feet. It will be
appreciated that the intensity value and/or the color value of the
first light distribution pattern 500A can be altered by employing
aforementioned user interface provided by the controller 410.
As illustrated in FIG. 5B, a second light distribution pattern 500B
(such as a wall washing lighting pattern) is generated at a
specific angle to illuminate a targeted surface associated
therewith. Herein, the second light distribution pattern 500B
comprises a light beam 502B emitted from the light source 404 to
illuminate the targeted surface. In an example, the second lighting
pattern 500B is generated at an angle of 30 degrees in an
anti-clockwise sense with respect to an axis 504B perpendicular to
the axis of linear arrangement of the light sources 402, 404 and
406. Notably, the second lighting pattern 500B is generated by
setting the magnitude of electrical potential of light source 402,
and light source 406 to 0 Volts and the magnitude of electrical
potential of light source 404 to specified maximum value, say 10
Volts, thereby generating the second light distribution pattern
500B comprising the light beam 502B. As shown, the second light
distribution pattern 500B is generated to illuminate a portion on
the wall 418, for example to highlight a work of art affixed on the
wall 418. It will be appreciated that the intensity value and/or
the color value of the second light distribution pattern 500B can
be altered by employing aforementioned user interface provided by
the controller 410.
As illustrated in FIG. 5C, a third light distribution pattern 500C
(such as a wall washing lighting pattern) is generated at a
specific angle to illuminate a targeted surface associated
therewith. Herein, the third light distribution pattern 500C
comprises a light beam 502C emitted from the light source 406 to
illuminate the targeted surface. In an example, the third light
distribution pattern 500C is generated at an angle of 45 degrees in
an anti-clockwise sense with respect to an axis 504C perpendicular
to an axis of linear arrangement of the light sources 402, 404 and
406. Notably, the third light distribution pattern 500C is
generated by setting the magnitude of electrical potential of light
source 402, and light source 304 to 0 Volts and the magnitude of
electrical potential of light source 306 to specified maximum
value, say 10 Volts, thereby generating the second light
distribution pattern 500C comprising the light beam 502C. It will
be appreciated that the intensity value and/or the color value of
the third light distribution 500C pattern can be altered by
employing aforementioned user interface provided by the controller
410.
As illustrated in FIG. 5D, a fourth light distribution pattern 500D
is generated to dominantly illuminate a targeted surface associated
with the light source 402. Herein, the fourth light distribution
pattern 500D comprises a light beam 502D emitted from the light
source 402, a light beam 504D emitted from the light source 404 and
a light beam 506D emitted from the light source 406 to illuminate
the targeted surface. In an example, the fourth light distribution
pattern 500D is generated by setting the magnitude of electrical
potential of the light source 402 to a specified maximum value, say
10 Volts to generate the light beam 502D, and the magnitude of
electrical potential of each of the light source 404 and the light
source 406 to a specified intermediate value, say 2 Volts, to
generate the light beams 504D and 506D respectively, thereby
generating the fourth light distribution pattern 500D. The fourth
light distribution pattern 500D is dominantly generated at an angle
of 30 degrees in an anti-clockwise sense with respect to an axis
508D perpendicular to an axis of arrangement of the light sources
402, 404 and 406. As shown, the lighting assembly 400 predominantly
illuminates the surface at the specified distance from the wall
418. It will be appreciated that the intensity value and/or the
color value of the fourth light distribution pattern 500D can be
altered by employing aforementioned user interface provided by the
controller 410.
As illustrated in FIG. 5E, a fifth light distribution pattern 500E
is generated to dominantly illuminate a target surface associated
with the light source 404. In an example, the fifth light
distribution pattern 500E is generated by setting the magnitude of
electrical potential of the light source 404 to a specified maximum
value, say 10 Volts to generate the light beam 504E, and the
magnitude of electrical potential of each of the light source 402
and the light source 406 to a specified intermediate value, say 2
Volts to generate the light beams 502E and the 506E respectively,
thereby generating the fifth light distribution pattern 500E. The
fifth light distribution pattern 500E is generated dominantly at an
angle of 30 degrees with respect to an axis 508E perpendicular to
an axis of arrangement of the light sources 402, 404 and 406. As
shown, the fifth light distribution pattern 500E is generated to
predominantly illuminate the targeted surface on the wall 418. It
will be appreciated that the intensity value and/or the color value
of the fifth light distribution pattern 500E can be altered by
employing aforementioned user interface provided by the controller
410.
As illustrated in FIG. 5F, a sixth light distribution pattern 500F
is generated to dominantly illuminate the target surface associated
with the light source 406. Herein, the sixth light distribution
pattern 500F, comprises a light beam 502F emitted from the light
source 402, a light beam 504F emitted from the light source 404 and
a light beam 506F emitted from the light source 406 to illuminate
the targeted surface. In an example, the sixth light distribution
pattern 500F is generated by setting the magnitude of electrical
potential of the light source 406 to a specified maximum value, say
10 Volts to generate the light beam 506F, and the magnitude of
electrical potential of each of the light source 402 and the light
source 404 to a specified intermediate value, say 2 Volts to
generate the light beams 502F and 504F respectively, thereby
generating the sixth light distribution pattern 500F. The sixth
light distribution pattern 500F is generated dominantly at an angle
of 45 degrees in a clockwise sense with respect to an axis 508F
perpendicular to an axis of linear arrangement of light sources
402, 404 and 406. As shown, the sixth light distribution pattern
500F is generated to predominantly illuminate the targeted surface
on the wall 418. It will be appreciated that the intensity value
and/or the color value of the sixth light distribution pattern 500F
can be altered by employing aforementioned user interface provided
by the controller 410.
Referring to FIG. 6, illustrated is a schematic representation of
arrangement of elements of a lighting assembly 600 (such as the
lighting assembly of FIG. 1), in accordance with an embodiment of
the present disclosure. As shown, the lighting assembly 600
comprises two light sources 602 and 604 (such as the light sources
of FIG. 1) that are arranged in a linear manner at a fixed
elevation. Further, the lighting assembly 600 comprises an optical
element 606 (such as the optical element of FIG. 1), and a
controller 608 (such as the controller of FIG. 1). The optical
element 606 is arranged at a same elevation relative to the light
source 602 and the light source 604. Furthermore, the light source
602 is arranged adjacent to one longitudinal end of the optical
element 606 and the light source 604 is arranged adjacent to the
other longitudinal end of the optical element 606. In other words,
the optical element 606 is disposed between the light sources 602
and 604. In an example, the optical element 606 is a light guide
employed to create a wall washing light distribution pattern in
different directions from the light received from the light sources
602 and 604.
Referring to FIGS. 7A-7D, illustrated are schematic representations
of different light distribution patterns provided by operating one
or more of the light sources 602 and 604 of FIG. 6 in accordance
with various embodiments of the present disclosure. Notably, FIGS.
7A to 7D are described in conjunction with elements from FIG. 6. As
illustrated in FIG. 7A, a first light distribution pattern 700A
(such as a ceiling wash pattern) is generated to illuminate the
targeted surface associated with the light source 602. Herein, the
first light distribution pattern 700A comprises a light beam 702A
emitted from the light source 602 to illuminate the targeted
surface. In an example, the first light distribution pattern 700A
is generated by setting the magnitude of electrical potential of
the light source 702 to a specified maximum value, say 10 Volts,
and the magnitude of electrical potential of the light source 704
to a specified minimum value, say 0 Volts, thereby generating the
first light distribution pattern 700A comprising the light beam
702A. The first light distribution pattern 700A is generated at an
angle of 45 degrees in clockwise sense with respect to a lateral
axis 704A of the optical element 606. As shown, the first light
distribution pattern 700A is a ceiling wash pattern generated to
illuminate, for example, a right portion of the ceiling. It will be
appreciated that the intensity value and/or the color value of the
first light distribution pattern 700A can be altered by employing
aforementioned user interface provided by the controller 608.
As illustrated in FIG. 7B, a second light distribution pattern 700B
(such as a ceiling wash pattern) is generated to illuminate a
target surface associated with the light source 604. Herein, the
second light distribution pattern 700B comprises a light beam 702B
emitted from the light source 704 to illuminate the targeted
surface. In an example, the second light distribution pattern 700B
is generated by setting the magnitude of electrical potential of
the light source 704 to a specified maximum value, say 10 Volts,
and the magnitude of electrical potential of the light source 702
to a specified minimum value, say 0 Volts, thereby generating the
second light distribution pattern 700B comprising the light beam
702B. The second light distribution pattern 700B is generated at an
angle of 45 degrees in an anti-clockwise sense with respect to a
lateral axis 704B of the optical element 606. As shown, the second
light distribution pattern 700B is a ceiling wash pattern generated
to illuminate, for example, a left portion of the ceiling. It will
be appreciated that the intensity value and/or the color value of
the second light distribution pattern 700B can be altered by
employing aforementioned user interface provided by the controller
608.
As illustrated in FIG. 7C, a third light distribution pattern 700C
(such as a ceiling wash pattern) is generated to dominantly
illuminate the target surface associated with the light source 602.
Herein, the third light distribution pattern 700C comprises a light
beam 702C emitted from the light source 602 and a light beam 704B
emitted from the light source 604 to illuminate the targeted
surface. In an example, the third light distribution pattern 700C
is generated by setting the magnitude of electrical potential of
the light source 602 to a specified maximum value, say 10 Volts to
generate the light beam 702C, and the magnitude of electrical
potential of the light source 604 to a specified intermediate
value, say 2 Volts to generate the light beam 704C, thereby
generating the third light distribution pattern 700C. The third
light distribution pattern 700C is generated predominantly at an
angle of 45 degrees in a clockwise sense with respect to a lateral
axis 706C of the optical element 606. As shown, the third light
distribution pattern 700C is a ceiling wash pattern generated to
predominantly illuminate a right portion of the ceiling and to
minimally illuminate a left portion of the ceiling. It will be
appreciated that the intensity value and/or the color value of the
third light distribution pattern 700C can be altered by employing
aforementioned user interface provided by the controller 608.
As illustrated in FIG. 7D, a fourth light distribution pattern 700D
(such as a ceiling wash pattern) is generated to dominantly
illuminate the target surface associated with the light source 704.
Herein, the fourth light distribution pattern 700D comprises a
light beam 702D emitted from the light source 602 and a light beam
704D emitted from the light source 604 to illuminate the targeted
surface. In an example, the fourth light distribution pattern 700D
is generated by setting the magnitude of electrical potential of
the light source 604 to a specified maximum value, say 10 Volts to
generate the light beam 702D, and the magnitude of electrical
potential of the light source 602 to a specified intermediate
value, say 2 Volts to generate the light beam 704D, thereby
generating the fourth light distribution pattern 700D. The fourth
light distribution pattern 700D is generated predominantly at an
angle of 45 degrees in an anti-clockwise sense with respect to a
lateral axis 706D of the optical element 606. As shown, the fourth
light distribution pattern 700D is a ceiling wash pattern generated
to predominantly illuminate a left portion of the ceiling and to
minimally illuminate a right portion of the ceiling. It will be
appreciated that the intensity value and/or the color value of the
fourth light distribution pattern 700D can be altered by employing
aforementioned user interface provided by the controller 608.
Referring to FIG. 8, illustrated is a schematic representation of
arrangements of elements of the lighting assembly 800 (such as the
lighting assembly of FIG. 1), in accordance with an embodiment of
the present disclosure. As shown, the lighting assembly 800
comprises three light sources 802, 804 and 806 (such as the light
sources of FIG. 1) that are arranged in a linear manner at a fixed
elevation. Further, the lighting assembly comprises one optical
element 808 (such as the optical element of FIG. 1) and one
controller 810 (such as the controller of FIG. 1). The optical
element 808 is arranged at a same elevation relative to the light
source 802. Furthermore, the light source 802 is arranged adjacent
to one longitudinal end of the optical element 808. Further, the
optical element 808 and the light source 802 are arranged at an
elevation different than the light source 804 and the light source
806. In an example, the light source 802 emits RED light, the light
source 804 emits BLUE light and the light source 806 emits GREEN
light. Further, the optical element 808 is a light guide employed
to create a wall wash light distribution pattern and/or a cove
light distribution pattern of monochromatic color or polychromatic
color in different directions from the light of different colors as
received from the light sources 802, 804 and 806.
Referring to FIGS. 9A-9E, illustrated are schematic representations
of different light distribution patterns provided by operating one
or more of the light sources 802, 804, and 806 of FIG. 8, in
accordance with various embodiments of the present disclosure.
Notably, FIGS. 9A to 9E are described in conjunction with elements
from FIG. 8. As illustrated in FIG. 9A, a first light distribution
pattern 900A (such as a ceiling wash pattern) is generated to
illuminate the targeted surface associated with the light source
802 emitting RED color. Herein, the first light distribution
pattern 900A comprises a light beam 902A emitted from the light
source 802 to illuminate the targeted surface. In an example, the
first light distribution pattern 900A is generated by setting the
magnitude of electrical potential of the light source 902 to a
specified maximum value, say 10 Volts, and the magnitude of
electrical potential of each of the light sources 904 and 906 to a
specified minimum value, say 0 Volts, thereby generating the first
light distribution pattern 900A comprising the light beam 902A. The
first light distribution pattern 900A is generated at an angle of
45 degrees in a clockwise sense with respect to a lateral axis 904A
of the optical element 808. In an example, the first light
distribution pattern 900A is a wall wash pattern generated to
illuminate a ceiling in red color. It will be appreciated that the
intensity value of the first light distribution pattern 900A can be
altered by employing aforementioned user interface provided by the
controller 810.
As illustrated in FIG. 9B, a second light distribution pattern 900B
(such as a cove lighting pattern) is generated to illuminate the
targeted surface associated with the light source 804. Herein, the
second light distribution pattern 900B comprises a light beam 902B
emitted from the light source 804 to illuminate the targeted
surface. In an example, the second light distribution pattern 900B
is generated by setting the magnitude of electrical potential of
the light source 804 to a specified maximum value, say 10 Volts,
and the magnitude of electrical potential of the light source 802
and the light source 806 to a specified minimum value, say 0 Volts,
thereby generating the second light distribution pattern 900B
comprising the light beam 902B. The second light distribution
pattern 900B is generated at an angle of 60 degrees in clockwise
sense with respect to a lateral axis 904B of the optical element
808. In an example, the second light distribution pattern 900B is
generated to illuminate, or aesthetically highlight a recess in the
ceiling in blue color. It will be appreciated that the intensity
value of the second light distribution pattern 900B can be altered
by employing aforementioned user interface provided by the
controller 810.
As illustrated in FIG. 9C, a third light distribution pattern 900C
(such as a cove lighting pattern) is generated to illuminate the
targeted surface associated with the light source 806. Herein, the
second light distribution pattern 900B comprises a light beam 902C
emitted from the light source 806 to illuminate the targeted
surface. In an example, the third light distribution pattern 900C
is generated by setting the magnitude of electrical potential of
the light source 806 to a specified maximum value, say 10 Volts,
and the magnitude of electrical potential of the light source 802
and the light source 804 to a specified minimum value, say 0 Volts,
thereby generating the third light distribution pattern 900C
comprising the light beam 902C. The third light distribution
pattern 900C is generated at an angle of 60 degrees in a clockwise
sense with respect to a lateral axis 904C of the optical element
808. In an example, the third light distribution pattern 900C is
generated to illuminate, or aesthetically highlight a recess in the
ceiling in green color. It will be appreciated that the intensity
value of the third light distribution pattern 900C can be altered
by employing aforementioned user interface provided by the
controller 810.
As illustrated in FIG. 9D, a fourth light distribution pattern 900D
is generated to dominantly illuminate a targeted surface associated
with the light source 802. Herein, the fourth light distribution
pattern 900D comprises a light beam 902D emitted from the light
source 802, a light beam 904D emitted from the light source 804 and
a light beam 906D emitted from the light source 806 to illuminate
the targeted surface. In an example, the fourth light distribution
pattern 900D is generated by setting the magnitude of electrical
potential electrical potential of the light source 802 to a
specified maximum value, say 10 Volts to generate the light beam
902B, and the magnitude of electrical potential of each the light
sources 804 and 806 to a specified minimum value, say 0 Volts to
generate the light beams 904D and 906D respectively, thereby
generating the fourth light distribution pattern 900D. The fourth
light distribution pattern 900D is generated at an angle of 60
degrees in a clockwise sense with respect to the lateral axis 908D
of the optical element 908. In an example, the fourth light
distribution pattern 900D is a ceiling wash pattern in a color
generated by mixing of the colors blue, red and green. It will be
appreciated that the intensity value of the fourth light
distribution pattern 900D to mix various colors can be altered by
employing aforementioned user interface provided by the controller
810.
As illustrated in FIG. 9E, a fifth light distribution pattern 900E
is generated to dominantly illuminate a targeted surface associated
with the light source 804. Herein, the fifth light distribution
pattern 900E comprises a light beam 902E emitted from the light
source 802, a light beam 904E emitted from the light source 804 and
a light beam 906E emitted from the light source 806 to illuminate
the targeted surface. In an example, the fifth light distribution
pattern 900E is generated by setting the magnitude of electrical
potential of the light source 804 to a specified maximum value, say
10 Volts to generate the light beam 904E, and the magnitude of
electrical potential of each the light sources 802 and 806 to a
specified intermediate value, say 5 Volts to generate the light
beam 902E and 906E respectively, thereby generating the fifth light
distribution pattern 900D at an angle of 60 degrees in a clockwise
sense with respect to a lateral axis 908E of the optical element
808. In an example, the fifth light distribution pattern 900E is
generated to illuminate, or aesthetically highlight a recess in the
ceiling in a color generated by mixing of the colors blue, red and
green. It will be appreciated that the intensity value of the fifth
light distribution pattern 900E to mix various colors can be
altered by employing aforementioned user interface provided by the
controller 810.
Referring to FIG. 10, illustrated is a schematic representation of
arrangements of a lighting assembly 1000 (such as the lighting
assembly of FIG. 1), in accordance with an embodiment of the
present disclosure. As shown, the lighting assembly 1000 comprises
two light sources 1002 and 1004 (such as the light sources of FIG.
1) that are arranged in a linear manner at a fixed elevation.
Further, the lighting assembly 1000 comprises one optical element
1006 (such as the optical element of FIG. 1) and one controller
1008 (such as the controller of FIG. 1). The optical element 1006
is arranged at a same elevation relative to the light source 1002.
Furthermore, the light source 1002 is arranged adjacent to one end
of the optical element 1006. Further, the optical element 1006 is
arranged at a different elevation than the light source 1004. In an
example, the optical element 1006 is a light guide configured to
create a wall wash light distribution pattern in a specified
direction from the light received from the light source 1002.
Furthermore, the light guide is configured to create a cove light
pattern from the light beam received from the light source
1004.
Referring to FIGS. 11A-11D, illustrated are schematic
representations of different light distribution patterns provided
by operating one or more of the light sources 1002, and 1004 of
FIG. 10, in accordance with various embodiments of the present
disclosure. Notably, FIGS. 11A to 11D are described in conjunction
with elements from FIG. 10. As illustrated in FIG. 11A, a first
light distribution pattern 1100 (such as a wall wash pattern) is
generated to illuminate the target surface associated with the
light source 1002. Herein, the first light distribution pattern
1100A comprises a light beam 1102A emitted from the light source
1002 to illuminate the targeted surface. In an example, the first
light distribution pattern 1100A is generated by setting the
magnitude of electrical potential of the light source 1002 to a
specified maximum value, say 10 Volts, and the magnitude of
electrical potential of the light source 1004 to a specified
minimum value, say 0 Volts, thereby generating the first light
distribution pattern 1100A comprising the light beam 1102A. The
first light distribution pattern 1100A is generated at an angle of
45 degrees in a clockwise sense with respect to a lateral axis
1104A of the optical element 1006. In an example, the first light
distribution pattern 1100A is a wall wash pattern generated to
illuminate a wall. It will be appreciated that the intensity value
of the first light distribution pattern 1100A can be altered by
employing aforementioned user interface provided by the controller
1108.
As illustrated in FIG. 11B, a second light distribution pattern
(such as a cove lighting pattern) is generated to illuminate a
target surface associated with the light source 1004. Herein, the
second light distribution pattern 1100B comprises a light beam
1102B emitted from the light source 1004 to illuminate the targeted
surface. In an example, the second light distribution pattern 1100B
is generated by setting the magnitude of electrical potential of
the light source 1004 to a specified maximum value, say 10 Volts,
and the magnitude of electrical potential of the light source 1002
to a specified minimum value, say 0 Volts, thereby generating the
second light distribution pattern 1100B comprising the light beam
1102B. The second light distribution pattern 1100B is generated at
an angle of 30 degrees in a clockwise sense with respect to a
lateral axis 1104B of the optical element 1006. In an example, the
second light distribution pattern 1100B is generated to illuminate,
or aesthetically highlight a recess in the ceiling. It will be
appreciated that the intensity value of the second light
distribution pattern 1100B can be altered by employing
aforementioned user interface provided by the controller 1008.
As illustrated in FIG. 11C, a third light distribution pattern
1100C (such as a wall wash pattern) is generated to dominantly
illuminate the target surface associated with the light source
1102. Herein, the third light distribution pattern 1100C comprises
a light beam 1102C emitted from the light source 1002 and a light
beam 1104B emitted from the light source 1004 to illuminate the
targeted surface. In an example, the third light distribution
pattern 1100C is generated by setting the magnitude of electrical
potential of the light source 1102 to a specified maximum value,
say 10 Volts to generate the light beam 1102C, and the magnitude of
electrical potential of the light source 1104 to a specified
intermediate value, say 2 Volts to generate the light beam 1104C,
thereby generating the third light distribution pattern 1100C. The
third light distribution pattern 1100C is generated predominantly
at an angle of 45 degrees in a clockwise sense with respect to a
lateral axis 1106C of the optical element 1006. As shown, the third
light distribution pattern 1100C is a wall wash pattern generated
to predominantly illuminate the wall and to minimally illuminate
the recess in the wall. It will be appreciated that the intensity
value of the third light distribution pattern 1100C can be altered
by employing aforementioned user interface provided by the
controller 1008.
As illustrated in FIG. 11D, a fourth light distribution pattern
1100D (such as a cove lighting pattern) is generated to dominantly
illuminate the target surface associated with the light source
1004. Herein, the fourth light distribution pattern 1100D comprises
a light beam 1102D emitted from the light source 1002 and a light
beam 1104D emitted from the light source 1004 to illuminate the
targeted surface. In an example, the fourth light distribution
pattern 1100D is generated by setting the magnitude of electrical
potential of the light source 1004 to a specified maximum value,
say 10 Volts to generate the light beam 1104D, and the magnitude of
electrical potential of the light source 1002 to a specified
intermediate value, say 5 Volts to generate the light beam 1102D,
thereby generating the fourth light distribution pattern 1100D. The
fourth light distribution pattern 1100D is generated predominantly
at an angle of 30 degrees in a clockwise sense with respect to a
lateral axis 1106D of the optical element 1006. As shown, the
fourth light distribution pattern 1100D is a cove lighting pattern
generated to predominantly illuminate the recess in the ceiling and
to minimally illuminate the wall. It will be appreciated that the
intensity value of the fourth light distribution pattern 1100D can
be altered by employing aforementioned user interface provided by
the controller 1008.
Referring to FIGS. 12A-12E, illustrated are schematic
representations of the arrangements of lighting assemblies 1200A,
1200B, 1200C, 1200D and 1200E (such as the lighting assembly of
FIG. 1) respectively, in accordance with various exemplary
embodiments of the present disclosure. As illustrated in FIG. 12A,
the lighting assembly 1200A comprises the light sources 1202A and
1204A (such as the light sources of FIG. 1) that are arranged in a
linear manner at a fixed elevation L1. Herein, the light sources
1202A and 1204A are spaced apart by a distance L2. The distance L2
will depend on the area that is intended to be illuminated by the
lighting assembly 1200A. In an example, the lighting assembly 1200A
is installed in a supermarket or a retail source. In the
illustrated example, the distance L1 may be about 3-5 meters and
the distance L2 may be about 3 meters, and such configuration may
be sufficient to illuminate an area with width of about 5 meters
(as shown). The light sources 1202A and 1204A may produce general
light distribution pattern having a wide beam width with a unified
glare rating (UGR) being under 19, so as to provide a visual
comfort to people present in the supermarket. Optionally, the light
sources 1202A and 1204A are sensitive to motion and one or both
light sources 1202A and 1204A are operational based on a motion
sensed in or around the intended illuminated area, thereby making
efficient use of energy resources. Notably, the other elements
(such as optical element and controller) of the lighting assembly
1200A are not visible to the user for aesthetic purposes.
As illustrated in FIG. 12B, the lighting assembly 1200B comprises
the light sources 1202B, 1204B and 1206B (such as the light sources
of FIG. 1) that are arranged in a linear manner at a fixed
elevation L1. Herein, the light sources 1202B and 1204B are spaced
apart by a distance L2 and the light sources 1204B and 1206B are
spaced apart by a distance L3. The distance L2 will depend on the
area that is intended to be illuminated by the lighting assembly
1200B. In an example, the lighting assembly 1200B is installed in a
supermarket or a retail source to illuminate shelf surfaces in a
retail store. The light sources 1202B, 1204B and 1206B generate
double asymmetric light distribution to efficiently illuminate each
side of the shelf surfaces. As shown, the light source 1202B
efficiently illuminates one surface of the shelf 1208B, and one
surface of the shelf 1210B. The light source 1204B efficiently
illuminates another surface of the shelf 1210B, and one surface of
the shelf 1212B. The light source 1206B efficiently illuminates
another surface of the shelf 1212B, and one surface of the shelf
1214B. Notably, the other elements (such as optical element and
controller) of the lighting assembly 1200B are not visible to the
user for aesthetic purposes.
As illustrated in FIG. 12C, the lighting assembly 1200C comprises
the light source 1202C (such as the light sources of FIG. 1). As
shown, the lighting assembly 1200C is installed to efficiently
illuminate a vertical surface associated with a shelf 1204C of a
retail store. In an example, the light source 1202C generates a
wall washing pattern to efficiently illuminate the shelf 1204C.
As illustrated in FIG. 12D, the lighting assembly 1200D comprises
the light sources 1202D, 1204D and 1206D (such as the light sources
of FIG. 1) that are arranged in a linear manner at a fixed
elevation L1. Herein, the light sources 1202D and 1204D are spaced
apart by a distance L2 and the light sources 1204D and 1206D are
spaced apart by a distance L3. The distances L2 and L3 will depend
on an area that is intended to be illuminated by the lighting
assembly 1200D. In an example, the lighting assembly 1200D is
installed in a workshop area. The light source 1204D generates a
task lighting pattern to efficiently illuminate the workbench
1208D. Notably, the task lighting pattern to illuminate the
workbench has a uniform glare rating under 19, thereby providing
visual comfort to the workers 1210D and 1212B performing a task on
the workbench 1208D. It will be appreciated that the light sources
1202D and 1206D are arranged on either side of the light source
1204D at the distance L2 and L3 to efficiently illuminate the
remaining regions of the workshop area. The light sources 1202D,
1204D and 1206D are controlled by the controller (not shown)
according to the requirements of the workers 1210D and 1212D.
As illustrated in FIG. 12E, the lighting assembly 1200E comprises a
light source 1202E (such as the light sources of FIG. 1) that is
arranged at a fixed elevation L1 in order to illuminate shelf
surface 1204E in a warehouse or the like. The light source 1202E
generates a light distribution pattern to illuminate a portion of a
shelf surface 1204E with less intensity and ground beneath thereof
with relatively higher intensity for aiding a user. The light
source 1202E can further be configured to switch between a first
light distribution pattern and a second light distribution pattern
to illuminate the portion of the shelf surface 1204E and ground
beneath thereof, respectively, by using a controller (not shown),
as required by the user 1206E.
Referring to FIG. 13, illustrated is a schematic representation of
the arrangement 1300 comprising two or more light sources 1302
(such as the light source of FIG. 1) and the at least one optical
element 1304 (such as the optical element of FIG. 1) arranged in a
suspended ceiling 1306. Throughout the present disclosure, the term
"suspended ceiling system" refers to any ceiling consisting of a
ceiling grid suspended or hung at a height below a structural
ceiling of architecture, such as a room of a house, or a building.
Furthermore, the suspended ceiling system is supported by the
hanging wires at a height to provide a gap between the structural
ceiling and the suspended ceiling system. As shown the suspended
ceiling system comprises T-bars 1308 suspended in the structural
ceiling via the hanging wires. Furthermore, a ceiling panel 1310 is
affixed to the T-bars 1308 with the aid of a supporting element
providing a space 1312 above the ceiling panel 1310. The light
source 1302 and the optical element 1304 are arranged in the space
1312 formed between the ceiling panel 1310 and the T-bar 1308.
Optionally, the one or more lighting assemblies may be arranged in
the suspended ceiling arrangement 1304. It will be appreciated that
the variations in the structural and functional aspects of the
embodiments of the lighting assembly, disclosed in FIGS. 2 to 12E
of the disclosure may be arranged in the suspended ceiling system
1304. It will be appreciated that FIG. 13 is merely an example,
which should not unduly limit the scope of the claims herein.
Referring to FIG. 14, illustrated is a system 1400 for providing
different light distribution patterns in an environment, in
accordance with an embodiment of the present disclosure. As
illustrated, the system 1400 comprises a control device 1402 and
one or more lighting assemblies 1404 (such as the lighting assembly
of FIG. 1) in a communication network 1406. The control device 1402
is configured to define a light distribution pattern to be provided
in the environment, and one or more lighting assemblies 1404 are
configured to provide different light distribution patterns based
on a control signal received from the control device 1402. Further,
each of the one or more lighting assemblies 1404 comprises two or
more light sources 1408 (such as the light sources of FIG. 1),
wherein each of the two or more light sources 1408 is configured to
emit a light beam, and wherein the two or more light sources 1408
are arranged in a manner so as to emit the respective light beams
along channels different from each other. Further, each of the one
or more lighting assemblies 1404 comprises at least one optical
element 1410 arranged with respect to the two or more light sources
1408 to be disposed along the channels of the emitted light beams
therefrom. The at least one optical element 1410 is configured to
guide the emitted light beams on different optical paths to
illuminate different targeted surfaces in the environment. Further,
each of the one or more lighting assemblies 1404 comprises a
controller 1412 operatively coupled to the two or more light
sources 1408 and in communication with the control device 1402 to
receive control signals therefrom. The controller 1412 is
configured to independently control electrical potential supplied
to the two or more light sources 1408 to regulate an intensity of
the light beams emitted therefrom based on the received one or more
control signals.
Throughout the present disclosure the term "control device" 1402 as
used herein refers to any programmable or non-programmable device
configured to generate control signals to generate and regulate the
light distribution patterns of the one or more lighting assemblies
1404. The control device 1402 may be a wired device or a wireless
device configured to generate control signals to control the one or
more lighting assemblies. Further, the system 1400 may comprise a
single control device 1402 serving as the central or master control
for the system. Optionally, the system 1400 may comprise numerous
control devices 1402 for controlling each of lighting assembly 1404
in the system. Furthermore, the control device 1402 is
communicatively coupled to the one or more lighting assemblies via
the communication network 1406 including, but not limited to, radio
wave signaling, infrared frequency signaling and wireless fidelity
within a network. It will be appreciated that the communication
network 1406 can be an individual network, or a collection of
individual networks that are interconnected with each other to
function as a single large network. The communication network 1406
may be wired, wireless, or a combination thereof. Examples of the
communication network 1406 include, but are not limited to, Local
Area Networks (LANs), Wide Area Networks (WANs), Metropolitan Area
Networks (MANs), Wireless LANs (WLANs), Wireless WANs (WWANs),
Wireless MANs (WMANs), the Internet, radio networks,
telecommunication networks, and Worldwide Interoperability for
Microwave Access (WiMAX) networks. Generally, the term "internet"
relates to any collection of networks using standard protocols. For
example, the term includes a collection of interconnected (public
and/or private) networks that are linked together by a set of
standard protocols (such as TCP/IP, HTTP, and FTP) to form a
global, distributed network. While this term is intended to refer
to what is now commonly known as the Internet.RTM., it is also
intended to encompass variations that may be made in the future,
including changes and additions to existing standard protocols or
integration with other media (e.g., television, radio, etc.). The
term is also intended to encompass non-public networks such as
private (e.g., corporate) Intranets. Optionally, the the control
device 1402 is communicatively coupled to the one or more lighting
assemblies 1408 via one or more of wired connections such as power
wiring, fiber optics, and the like. Optionally, the control device
1402 can be a manually operated device or an automatic device to
control one or more lighting assemblies. In an example, the one or
more lighting assemblies 1408 are controlled via the control device
1402 using a communication network 1406.
In an example, the control device 1402 is a remote-control device
programmed to communicate wirelessly with the one or more lighting
assemblies 1408 in an RF environment. The remote-control device
generates a control signal corresponding to a light distribution
pattern, which is received by the controller 1412 of the one or
more lighting assemblies 1408. Further, a light distribution
pattern is generated based on the control signal. Optionally, the
control device 1402 is provided with several controls such as one
or more buttons to switch between various light distribution
patterns, and/or to control various parameters of the selected
light distribution pattern. In another example, the control device
1402 is a smart phone configured to be in communication with the
one or more light sources. The smart phone is provided with the
user interface having one or more controls to transit between
various light distribution patterns and subsequently change a
property thereof. In an example, the control device 1402 is
configured to be operated in a manual mode or an automatic mode as
required. Optionally, the control device 1402 may generate control
signals to control the light distribution pattern of the one or
more lighting assemblies 1408 based on a visual task being
performed in the environment, a time of the day or a particular
date. In an example, the control device 1402 may generate control
signals to provide different light distribution patterns for
reading, watching television, sleeping and the like. Optionally,
the control device 1402 comprises a transmitter for transmitting
the control signals. Notably, each of the aforementioned
controllers 1412 in the one or more lighting assemblies comprises a
receiver to receive the control signals transmitted by the control
device 1402.
According to an embodiment the system 1400 further comprises an
imaging sensor communicatively coupled to the control device 1402.
The imaging sensor 1414 is configured to capture an image of the
environment, process the image to acquire lighting intensity values
for different targeted surfaces of the environment, and transmit
the acquired lighting intensity values to the control device 1402.
Throughout the present disclosure, the term "imaging sensor" as
used herein refers to a device to capture an image of the
environment, convert the image to a digital image, apply the image
processing techniques known in the art to deduce various properties
of the image, such as intensity, color, temperature and the like.
Furthermore, the imaging sensor 1414 is configured to transmit the
information to the control device 1402. The different types of
imaging sensor 1414 include, but are not limited to, a camera, a
photo sensor (for acquiring intensity values), or any other image
sensing device.
According to an embodiment, the control device 1402 is configured
to receive the acquired information pertaining to an image in the
environment. Furthermore, the control device 1402 generates the one
or more control signals based on the acquired lighting intensity
values for different targeted surfaces of the environment. The
control device 1402 may be configured to automatically generate one
or more control signals to alter the light distribution patterns of
the one or more assemblies 1408 based on the acquired intensity
values for different targeted surfaces in the environment.
Optionally, the control device 1402 operates in a closed loop
system with the imaging sensor 1414 and automatically optimizes the
one or more lighting assemblies 1408 based on the tasks performed
in the environment. In an example, when the imaging sensor 1414
acquires an image of a person reading a book (as may be detected by
using image recognition processing), the control device 1402
generates a signal to provide a light distribution pattern to
correctly illuminate the area where the person is reading. Such a
system 1400 will not only provide correct lighting to the
environment, but also reduce wastage of energy. In another example,
when the imaging sensor 1414 acquires an image of a person
sleeping, the control device 1402 automatically generates a control
signal to decrease the intensity of the light in the
environment.
According to an embodiment, the control device 1402 comprises a
display screen for presenting a user interface. The control device
1402 is configured to generate a lighting intensity map for the
environment based on the light intensity values acquired by the
imaging sensor 1414. Further, the control device 1402 is configured
to display the generated lighting intensity map on the display
screen. The term "lighting intensity map" as used herein refers to
a digital image generated by applying false color image processing
to the image captured by the imaging sensor 141. Each of the pixel
in the digital image is mapped to a specific luminance value, say
in Candela per meter square. The variations in the luminance values
in the image are mapped to different colors to visually highlight
variations in intensity in the environment so that the variations
are easily perceivable by the human eye. Further, the control
device 1402 is configured to receive one or more user inputs, via
the user interface, to define the light distribution pattern for
the environment. The user interface may display information
persisting to the captured image of the environment, such as
intensity values, spectrum values, temperature values and the like.
Further, the user interface receives one or more user inputs on the
displayed lighting intensity map to define the light distribution
pattern for the environment. In an example, the user interface may
provide the user to define a light distribution pattern based on
the lighting intensity map and save the lighting intensity map to a
memory associated with the control device 1402 for future
retrieval. Furthermore, the user interface may also provide the
user with an option to select between an automatic mode (i.e.
control device 1402 automatically generates light distribution
patterns based on a set of instructions) and a manual mode (i.e.
control device 1402 receives inputs from the user to define a light
distribution pattern). Furthermore, the user interface may provide
the user with an option to select between various pre-configured
light distribution patterns stored in the aforementioned memory
associated with the controller. Moreover, the user interface may
provide the user to regulate the parameters of a selected light
distribution pattern.
The term "user interface (UI)" relates to a structured set of user
interface elements rendered on a display screen. Optionally, the
user interface (UI) rendered on the display screen is generated by
any collection or set of instructions executable by an associated
digital system. Additionally, the user interface (UI) is operable
to interact with the user to convey graphical and/or textual
information and receive input from the user. Specifically, the user
interface (UI) used herein is a graphical user interface (GUI).
Furthermore, the user interface (UI) elements refer to visual
objects that have a size and position in user interface (UI). A
user interface element may be visible, though there may be times
when a user interface element is hidden. A user interface control
is considered to be a user interface element. Text blocks, labels,
text boxes, list boxes, lines, and images windows, dialog boxes,
frames, panels, menus, buttons, icons, etc. are examples of user
interface elements. In addition to size and position, a user
interface element may have other properties, such as a margin,
spacing, or the like.
Referring to FIG. 15, illustrated is a schematic representation of
a system 1500 comprising a control device 1502 (such as the control
device of FIG. 1) with the imaging sensor (not shown) integrated
therein, a lighting assembly 1504 (such as the lighting assembly of
FIG. 1) comprising three light sources 1506, 1508, and 1510 for
providing light distribution patterns in an environment, in
accordance with an embodiment of the present disclosure. In an
example, the control device 1502 having an integrated imaging
sensor is a smart phone device 1502. As shown, the imaging sensor
integrated in the smart phone device 1502 captures an image of a
hallway 1512, having a corridor with rows of shelves on either
side. Further, the smart phone device 1502 captures intensity
values associated with the image. The smart phone device 1502
applies false color image processing to the acquired image to
generate the lighting intensity map 1514 which is displayed to the
user on the display screen associated with the smart phone device
1502. The lighting intensity map 1514 highlights variations in
intensity. In an example, the corridor is darker than the shelves;
the user interface receives inputs from the user to increase the
electrical potential of the light source 1508 thereby increasing
the intensity of the light in the corridor to uniformly illuminate
the hallway.
The present disclosure also relates to a computer implemented
method for providing different light distribution patterns in an
environment by implementing a lighting assembly. Various
embodiments and variants disclosed above apply mutatis mutandis to
the method.
Referring to FIG. 16, illustrated is a schematic representation of
steps of a computer implemented method 1600 for providing different
light distribution patterns in an environment, in accordance with
an embodiment of the present disclosure. At step 1602, a lighting
assembly (such as, the lighting assembly 100 of FIG. 1) is
implemented. Herein, the lighting assembly comprises two or more
light sources. Each of the two or more light sources is configured
to emit a light beam, and wherein the two or more light sources are
arranged in a manner so as to emit the respective light beams along
channels different from each other, and at least one optical
element arranged with respect to the two or more light sources to
be disposed along the channels of the emitted light beams
therefrom. The at least one optical element configured to guide the
emitted light beams on different optical paths to illuminate
different targeted surfaces in the environment. At step 1604, an
image of the environment is captured. At step 1606, the image is
processed to acquire lighting intensity values for different
targeted surfaces of the environment. At step 1608, a light
distribution pattern is defined for the environment based on the
acquired lighting intensity values for different targeted surfaces
of the environment. At step 1610, the electrical potential supplied
to the two or more light sources is independently controlled to
regulate an intensity of the light beams emitted therefrom based on
the defined light distribution pattern.
As an alternative means of adjusting the allocation of electrical
power among light source channels to regulate light distribution
patterns in some embodiments, the electrical impedance within
individual light source channels can be set by the inclusion of an
impedance increasing component on the LED board. For example by the
use of a resistor that is fixedly arranged into an electrical
circuit on a LED board. A specific resistor can be selected at the
time of LED board manufacture to provide a particular power
allocation amount light source channels and subsequently, a
specific light distribution. The proportional allocation of
electrical power to individual light source channels can be
achieved by making a light source channel a parallel electrical
circuit and including a resistor in at least one of the parallel
circuits to reduce current flow within that parallel branch.
Transmissive optical element--A transmissive optical element is
comprised of a light transmissive material; for example glass,
quartz, silicone, polymethyl methacrylate (acrylic), polycarbonate.
Transmissive lenses in typical lighting assembly embodiments
include lens features to adjust distribution of light from light
channels and typically the lens features create at least one focal
region within the lighting assembly. The specific geometry of a
focal region is dependent on the particular lens design; for
example, the focal region for spherical Fresnel lenses is a focal
point. The focal region for cylindrical Fresnel lens is a focal
line. Fresnel lens array.
Fresnel Lens--A Fresnel lens is a particular lens type well suited
for use in lighting assembly embodiments. Fresnel lenses can be
configured over a large range of size, scale, and shape. In some
embodiments the surface of a transmissive lens is completely
covered by a single Fresnel pattern while in other embodiments and
array of smaller Fresnel patterns is used. Spherical, cylindrical,
rectangular, and hexagonal are all commonly used geometric
configurations.
Light source channel--Each light source channel comprises at least
one light source. Light source channels of multiple light sources
are typically arranged in a pattern; for example a linear array, a
rectangular grid, a circular pattern, or a circular pattern of
concentric rings. In order to achieve specific desired light
distributions from the lighting assembly, multiple light source
channels are positioned differently with respect to the focal
region of lens features in the transmissive lens. Typically at
least one light source channel is positioned outside of a focal
region.
For clarity of explanation, FIG. 17 through FIG. 25 illustrate a
variety of individual characteristics and features of novel
lighting assemblies shown applied within linear light fixtures. It
should be appreciated that the illustrated individual features can
be combined in various embodiment lighting assemblies configured
withing a wide variety of lighting fixtures.
FIG. 17 is a perspective view of a lighting assembly which includes
a LED board 1702 with a linear array of LED light sources 1704
mounted inside a housing 1706. In this embodiment the optical
element 1708 has surface features on the inner face of a light
transmissive material, specifically an array of linear triangular
prism features aligned in the same longitudinal direction as the
LED Board. The optical element in this embodiment also has lens
support structures 1710 to aid in mounting the lens within the
housing. The housing 1706 encloses the assembly and holds
components in positions. In some embodiments the optical element
can be slid into the housing and held in place due to paired
extruded geometry profiles. LED light sources 1704 emit light which
propagates through the optical element 1708.
FIG. 18 is a cross-section view of a lighting assembly containing
the similar elements of FIG. 18 but with an optical element 1808
comprising a Fresnel lens of with Fresnel lens axis 1814 and a lens
support arm 1810. A LED Board 1802 contains a linear array of LEDs
1804. A housing 1806 serves to support and contain the lighting
assembly. The optical element 1808 has linear Fresnel lens pattern
extended longitudinally in the length of the fixture. The Fresnel
lens axis 1814 is offset from the optical axis 1812 of the LED
linear array at an angle .alpha. which cause a tilting of the
optical axis of the light distribution exiting the lighting
assembly. This tilted light output can be seen as angle .beta. in
FIG. 19A which is a polar plot of the light distribution of the
embodiment of FIG. 18. This type of angular offset is useful in
certain illumination applications such as wall washing or wall
grazing. FIGS. 19A and 19B also illustrates the effect of
increasing upon light distribution of increasing the amount of
light scattering diffusion within the optical element. As diffusion
increases from FIG. 19A with 5% diffusion blend to FIG. 19B with
20% diffusion blend, the angular offset of the light output remains
but the width of the beam output increases and the peak intensity
decreases. For the embodiment of FIG. 18 and the corresponding
plots of its light distribution in FIGS. 19A and 19B, the light
scattering diffusion is provided by a blend within the optical
element of light scattering microbeads of cross-linked PMMA acrylic
of approximately 7 um diameter dispersed in a matrix of PMMA resin.
The 5% diffusion of FIG. 19A is 5% concentration of cross-linked
PMMA in amorphous PMMA resin and 20% diffusion of FIG. 19B is 20%
concentration of cross-linked PMMA microbeads in amorphous PMMA
resin. Critical to achieving a volumetric light scattering effect
is a difference in refractive index between the matrix material and
dispersed regions, in this case dispersed regions being microbeads.
Microbeads of other optically transmissive materials can be
substituted. Specific examples included but are not limited to
silicone, COC, glass, and silica. PMMA is a popular choice for
optical elements but other light transmissive materials such as
polycarbonate, COC, silicone, glass, or quartz can be utilized. As
an alternative or complementary means of providing light
scattering, surface features such as lens features or surface
texturing can be utilized.
FIG. 20 shows a cross-section view of lighting assembly embodiment
in which the optical element 2008 merges two Fresnel lens patterns,
both of which have their focal axes, 2014A and 2014B offset from
the centerline of the fixture and optical axis 2012 of the linear
LED array 2002 mounted on a LED board 2004. This offset is
illustrated with angles .alpha.1 and .alpha.2 which produce two
lobes in the polar plot light distribution as shown in FIG. 21. In
this embodiment the lens is planar and mounts in the housing 2006
without extended lens support features. This more simple lens
geometry is generally easier to manufacture and makes feasible a
greater variety of manufacturing processes such as film and sheet
casting or embossing, stamping, and injection molding. It can be
applied to any other embodiments where desired.
FIG. 22 shows a lighting assembly embodiment in which the lens has
a Fresnel lens pattern on the inner face aligned with the center
line of the fixture housing 2206, the optical axis of the LED Board
2202, LED linear array 2204, and the focal axis 2212 of the Fresnel
lens pattern on the optical element 2212. In this case the
resultant light distribution is normal to the light fixture as seen
in FIG. 23A. Optionally, a light scattering diffusion lens 2220 can
be inserted into the lighting assembly to increase the beam width
as shown in FIG. 23B. Additionally, the optional diffusion lens
aids smoothing the beam pattern by reducing intensity spikes or
color variation over angle.
FIG. 24A shows a lighting assembly embodiment in which the optical
element 2408 has a Fresnel lens pattern on the inner face having a
focal axis 2412 aligned with the center line of the optical axis of
the LED linear array 2404 which is part of the LED board 2402, all
held in place and enclosed by the housing 2406. A linear lenticular
lens 2430 with lenticular features aligned in a transverse
direction normal to the longitudinal direction of the linear
Fresnel lens is positioned between the LED array 2404 and the
optical element 2408. The resultant light distribution is plotted
in the polar plot of FIG. 24B showing both transverse and
longitudinal axes. The transverse axis light distribution 2401
across the width of the light fixture shows a very narrow beam
pattern while the longitudinal axis light distribution 2403 shows a
wider beam pattern due to spread by the lenticular lens 2430. In
addition to providing the asymmetric beam pattern, the transverse
lenticular pattern spreads the image of individual LED light
sources longitudinally to provide a more smooth and uniform
appearance. FIG. 24C is a photograph showing the improved
uniformity appearance of the combined lenticular lens 2430 plus
optical element 2408 vs. only optical element 2408 in obscuring the
view of individual LED light sources 2402.
FIG. 25 is a cross-section view of a lighting assembly embodiment
with three light source channels and a Fresnel lens. FIG. 25 shows
a lighting assembly embodiment in which 3 LED boards, 2502A, 2502B,
and 2502C each containing a respective linear array of LEDs 2504A,
2504B, and 2504C are aligned in parallel with each other and the
length of the assembly and function as 3 independent light source
channels, each with adjustable control of electrical power and
light output. Each linear array of LEDs has a unique input angle
.alpha. (.alpha.1, .alpha.2, .alpha.3) with respect to the center
of the Fresnel lens pattern that results in a unique output axis
.beta. (.beta.1, .beta.2, .beta.3). In this way, by controlling
electrical power to individual LED boards, the output light
distribution can be controlled to provide any combination of the 3
distinct light distributions; (.beta.1, .beta.2, .beta.3). The
center LED array 2504B, is aligned with the focal axis 2512B of the
Fresnel lens pattern 2510 of the optical element 2508. This
alignment produces an output pattern also aligned with the focal
axis as notated by 132 showing zero beam pattern deflection.
Typically in this type of configuration the distance from the LED
light source 2502B to the Fresnel lens pattern 2510 would be the
same or similar to the focal length of the Fresnel lens pattern so
that the LED light source 2504B is in the focal region of the of
the Fresnel Lens pattern. In this embodiment, the linear Fresnel
lens pattern has a focal line aligned with the LED array 2504B. The
other two light source channels having linear LED arrays 2502A and
2502C have respective optical axes 2512A and 2512C that are offset
from the focal axis 2512B of the Fresnel lens pattern 2510. Light
output from LED arrays 2502A and 2502C therefore input light into
the Fresnel lens pattern 2510 at input angles .alpha.1 and .alpha.3
which result in tilted output angles .beta.1 and .beta.3
respectively.
FIG. 26A is a perspective of a round downlight suitable for
mounting into a ceiling. A housing 2606 supports and contains the
inner optical assembly. A front plate 2616 holds the optical
element 2608 in place.
FIG. 26B is an exploded view of the round downlight embodiment of
FIG. 26A. A LED board 2602 has an array of LEDs 2604 which contain
at least two independent light source channels which are both
electrically and physically independent. The LED array 2604 is
mounted off-center in the fixture to enable a tilt beam light
distribution. The reflector 2618 also enables a tilt beam light
distribution due to its asymmetric shape. The optical element 2608
contains a circular Fresnel lens pattern and it is sealed between
the housing 2606 and front plate 2616 with the aid of gaskets 2609A
and 2609B. By adjusting the electrical power supplied to individual
light source channels the amount of beam tilt can be adjusted.
FIG. 27A is an exploded view of a round downlight embodiment. The
same lighting assembly embodiment is shown in FIG. 27B, FIG. 27C,
and FIG. 27D. A LED board 2602 contains three light source
channels, 2704A, 2704B, and 2704C, each comprising an array of LEDs
that are both positioned physically separately and electrically
independently controlled. LED array 2704A has a central cluster of
one or more LEDs that are positioned at a the focal point of the
Fresnel lens pattern of optical element 2708. LED array 2704B has
an inner ring of LEDs that encircle the central cluster of LED
array 2704A. LED array 2704C has an outer ring of LEDs that
encircle the other two LED arrays. A reflector 2718 helps contain
and guide light output form the LEDs to the optical element 2708.
FIGS. 27B, 27C, and 27D each illustrate use of a specific light
source channel. With the center LED array 2704A powered a narrow
beam pattern is produced. With the inner ring LED array 2704B
powered a medium beam pattern is produced. With the outer ring LED
array 2704C powered a wide beam pattern is produced. By adjusting
the proportion of electrical power to each of these three channels,
the light distribution can be adjusted to meet specific desired
beam patterns.
Modifications to embodiments of the present disclosure described in
the foregoing are possible without departing from the scope of the
present disclosure as defined by the accompanying claims.
Expressions such as "including", "comprising", "incorporating",
"have", "is" used to describe and claim the present disclosure are
intended to be construed in a non-exclusive manner, namely allowing
for items, components or elements not explicitly described also to
be present. Reference to the singular is also to be construed to
relate to the plural.
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